"The Body Structure Of A Beluga Whale Makes It Look Like It Has Legs"
"The outline of symmetrical bones protruding from their underbellies creates an illusion that probably baffled many sailors in the early days of nautical discovery. When these whales swim, their fat pads are often tensed in order to maintain balance, which causes them to protrude outward and resemble knees."
#21 goes for cats in general